/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/SkeletalMeshModifiers/Public/SkinWeightModifier.h
Though it may be useful to normalize while editing.
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)(BlueprintType) class USkinWeightModifier : public [UObject](API\Runtime\CoreUObject\UObject\UObject)